Gravitinos and hidden Supersymmetry at the LHC - UniversitÃ¤t ...

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Gutachter der Dissertation: Gutachter der Disputation: Prof. Dr. Wilfried Buchmüller Prof. Dr. Peter Schleper Prof. Dr. Daniel Wyler Prof. Dr. Wilfried Buchmüller Prof. Dr. Jan Louis Datum der Disputation: 20. Juni 2012 Vorsitzender des Prüfungsausschusses: Vorsitzender des Promotionsausschusses: Dekan der Fakultät für Mathematik, Informatik und Naturwissenschaften: Dr. Georg Steinbrück Prof. Dr. Peter H. Hauschildt Prof. Dr. Heinrich Graener
Abstract We investigate phenomenological consequences of locally supersymmetric extensions of the Standard Model consistent with primordial nucleosynthesis, leptogenesis and dark matter constraints. An unequivocal prediction of local supersymmetry is the existence of the gravitino, the spin-3/2 superpartner of the graviton. Due to its extremely weak couplings, decays involving the gravitino in the initial or the final state may cause problems in the early universe. One class of models solving the gravitino problem makes the gravitino either the heaviest or the lightest supersymmetric particle (LSP), while predicting a higgsino-like neutralino as the LSP or the next-to-lightest superparticle (NLSP), respectively. In both cases the LHC phenomenology is determined by the higgsino states. The mass degeneracy between the charged and neutral states, together with very heavy colored states, prevent an early discovery at the LHC, especially if one demands a lightest Higgs mass compatible with the recent LHC signal excess. Another class of models, in which the gravitino is also a dark matter candidate, introduces a small violation of R-parity to render the cosmology consistent. In this case, the phenomenology at the LHC is determined by the R-parity violating decays of the NLSP which can be a bino-like or a higgsino-like neutralino or a stau. Using a novel approach to describing bilinear R-parity violation, we compute decay rates of the gravitino and the possible NLSP. Due to a connection between the gravitino and neutralino decay widths, we can predict the neutralino NLSP decay length at the LHC directly from the recent Fermi-LAT results for decaying dark matter searches. The decays of the NLSP in the detectors distort the missing transverse energy (MET) signature, which complicates the searches relying on it, while creating a new secondary vertex signature. We conclude that for gluino and squark masses accessible at the LHC, searches based on secondary vertices can probe values of the R-parity breaking parameter which are far below the present upper bounds obtained from astrophysics and cosmology.
Page 1: Gravitinos and hidden Supersymmetry
Page 7: In memory of my father, Feliks Bobr
Page 10 and 11: CONTENTS 4.2.1 Gravitino Decays . .
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CHAPTER 2. SUPERSYMMETRY AND SUPERG
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CHAPTER 3. R-PARITY BREAKING 3.1 R-
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CHAPTER 3. R-PARITY BREAKING the in
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CHAPTER 3. R-PARITY BREAKING They a
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CHAPTER 3. R-PARITY BREAKING unitar
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CHAPTER 3. R-PARITY BREAKING Superf
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CHAPTER 3. R-PARITY BREAKING terms
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CHAPTER 4. BROKEN R-PARITY: FROM TH
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-1 10 -2 10 Ex 9.3 mSUGRA Interpret
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CHAPTER 5. HIDDEN SUPERSYMMETRY AT
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CHAPTER 6. CONCLUSIONS AND OUTLOOK
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CHAPTER 6. CONCLUSIONS AND OUTLOOK
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Appendix A Two Component Spinor Tec
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A.2. SPINOR REPRESENTATIONS OF SL(2
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A.3. PROPERTIES OF FERMION FIELDS w
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A.4. FEYNMAN RULES ( 1 2 , 0) fermi
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A.4. FEYNMAN RULES i, ˙α a, µ i,
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A.5. SUMMARY OF SPINOR ALGEBRA AND
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Appendix B Gauge and Mass Eigenstat
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B.2. NEUTRAL AND CHARGED CURRENTS w
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B.2. NEUTRAL AND CHARGED CURRENTS I
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B.2. NEUTRAL AND CHARGED CURRENTS T
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B.2. NEUTRAL AND CHARGED CURRENTS T
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B.2. NEUTRAL AND CHARGED CURRENTS w
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B.2. NEUTRAL AND CHARGED CURRENTS +
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Bibliography [1] S. Weinberg, The m
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BIBLIOGRAPHY [30] C. Dappiaggi, T.-
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BIBLIOGRAPHY [63] N.-E. Bomark, S.
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BIBLIOGRAPHY [98] M. Quiros, Constr
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BIBLIOGRAPHY [131] W. Buchmuller, L
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BIBLIOGRAPHY [163] B. de Carlos and
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BIBLIOGRAPHY [196] ATLAS Collaborat
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BIBLIOGRAPHY [226] S. A. Malik, Sea
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BIBLIOGRAPHY [259] G. Roepstorff, E
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